#include <xc.h>
#include <stdint.h>
#include <stdbool.h>
 
// Configuration bits
#pragma config FOSC = FRC     // Internal oscillator
#pragma config FWDTEN = OFF   // Watchdog timer disabled
 
// Define LED pins
#define RED_LED LATBbits.LATB0
#define WHITE_LED LATBbits.LATB1
#define GREEN_LED LATBbits.LATB2
#define POWER_BUTTON PORTAbits.RA0
 
// Function prototypes
void initializeIO(void);
void initializeTimer(void);
 
volatile bool powerOn = true; // State of power button
 
void __attribute__((interrupt, no_auto_psv)) _T1Interrupt(void) {
    static bool greenLEDState = false;
    IFS0bits.T1IF = 0; // Clear Timer1 interrupt flag
 
    // Toggle green LED every 2 seconds
    greenLEDState = !greenLEDState;
    GREEN_LED = greenLEDState;
}
 
void initializeIO(void) {
    // Set LEDs as outputs
    TRISBbits.TRISB0 = 0; // Red LED
    TRISBbits.TRISB1 = 0; // White LED
    TRISBbits.TRISB2 = 0; // Green LED
 
    // Set button as input
    TRISAbits.TRISA0 = 1;
 
    // Initial LED states
    RED_LED = 1;  // Power ON state
    WHITE_LED = 0;
    GREEN_LED = 0;
}
 
void initializeTimer(void) {
    T1CON = 0x8030; // Timer1 ON, prescaler 1:256
    PR1 = 15625;    // For 2-second delay (assuming 4 MHz clock)
    IFS0bits.T1IF = 0; // Clear Timer1 interrupt flag
    IEC0bits.T1IE = 1; // Enable Timer1 interrupt
}
 
int main(void) {
    initializeIO();
    initializeTimer();
 
    while (1) {
        // Poll the power button
        if (POWER_BUTTON == 1) {
            __delay_ms(50); // Debounce delay
            if (POWER_BUTTON == 1) {
                powerOn = !powerOn; // Toggle power state
                __delay_ms(500); // Button hold delay
            }
        }
 
        if (powerOn) {
            RED_LED = 1;
            WHITE_LED = 0;
        } else {
            RED_LED = 0;
            WHITE_LED = 1;
            GREEN_LED = 0; // Ensure green LED is off when powered down
        }
    }
 
    return 0;
}
 

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